Article
Chemistry, Physical
Thomas Kuckhoff, Katharina Landfester, Kai A. I. Zhang, Calum T. J. Ferguson
Summary: Efficient and heterogeneous photocatalytic polymer hydrogel with high transmittance and photocatalytic properties has been developed for pollutant degradation, including inorganic metal and organic contaminants. The material demonstrates versatility and reusability in large-scale experiments, showing promising potential for practical applications.
CHEMISTRY OF MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Maryam Sadeghi, Maryam Heydari, Vahid Javanbakht
Summary: In this study, a heterogeneous photocatalyst was prepared using sol-gel method to coat titanium dioxide nanoparticles onto the surface of magnetite nanoparticles, for efficient degradation of DR-80 dye. Experimental results and data analysis showed that the synthesized nanocatalyst exhibited improved properties for high-efficiency dye removal.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Electrochemistry
Jorge Vidal, Maria E. Baez, Wendy Calzadilla, Mario Aranda, Ricardo Salazar
Summary: This study investigates the electro-remediation of two soils contaminated with chloridazon (CLZ), an herbicide commonly used in agriculture. The electro-kinetic soil washing (EKSW) process achieved removal percentages of 100% and 63% for the two soils, without altering their physicochemical properties. The washing water was effectively treated by electro-oxidation, leading to complete degradation and partial mineralization of CLZ and its metabolites.
ELECTROCHIMICA ACTA
(2022)
Article
Engineering, Chemical
Alina Pruss, Agnieszka Kociuba, Aleksandra Przybylska, Agnieszka Zgola-Grzeskowiak, Robert Frankowski, Jerzy Kupczyk
Summary: Chloridazon is a banned herbicide used on sugar beet crops, but its metabolites are still present in the environment and pose a threat to human health. A pilot research installation using a UV lamp and biological activated carbon filters (BACF) was found to be effective in removing organic pollutants, depending on their type and concentration.
DESALINATION AND WATER TREATMENT
(2023)
Review
Environmental Sciences
Mostafa Hadei, Alireza Mesdaghinia, Ramin Nabizadeh, Amir Hossein Mahvi, Shahram Rabbani, Kazem Naddafi
Summary: This study systematically reviewed research articles on the photocatalytic degradation of pesticides using TiO2 nanoparticles and UV irradiation, with a total of 112 eligible articles included. Sixteen types of TiO2 were studied, with an average photodegradation efficiency of 71%. The study also discussed the impact of experimental conditions on photocatalytic activity, strategies to reduce energy requirements, and future research directions.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Review
Chemistry, Multidisciplinary
Chun Zhao, Ying Wang, Xuxu Wang, Dionysios D. Dionysiou
Summary: This article reviews the development of electrophotocatalytic processes (EPPs) for the treatment of contaminants of emerging concern (CECs) and pathogens, explaining the mechanisms and effects of EPPs under UV/visible light. It discusses the active radicals and holes generated during photochemical/photocatalytic processes, operational conditions, oxidation paths, effects of different photoelectrodes, and the combination with other systems for CECs degradation and pathogen inactivation. The main trends in the field, knowledge gap, and recommendations for further developments are highlighted.
CURRENT OPINION IN GREEN AND SUSTAINABLE CHEMISTRY
(2021)
Article
Materials Science, Multidisciplinary
Xuquan Wang, Yang Li, Fei Wang, Baoqiang Xu, Bin Yang, Yang Tian
Summary: Sodium gadolinium molybdate (Na0.5Gd0.5MoO4) powder, prepared using GdCl3 center dot 6H(2)O, H2NCSNH2, and Na2MoO4 center dot 2H(2)O, exhibited enhanced photocatalytic performance for rhodamine B (RhB) degradation under visible light, with increased Gd3+ ions contributing to its improved photocatalytic ability.
JOURNAL OF MATERIALS SCIENCE
(2021)
Review
Environmental Sciences
K. Sharma, D. Vaya, G. Prasad, P. K. Surolia
Summary: This review primarily focuses on the treatment of oily wastewater through advanced oxidation processes, primarily the photocatalytic process. The basic functioning mechanism of photocatalysts and their modifications have been explained, as well as the impact of photocatalysis on the degradation of harmful oily pollutants in water.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Review
Chemistry, Multidisciplinary
Oluchi V. Nkwachukwu, Omotayo A. Arotiba
Summary: Diversifying water treatment methods with materials like perovskites and their composites shows promise in addressing global water availability challenges. The exploration and application of these materials are crucial in developing more efficient solutions for water treatment.
FRONTIERS IN CHEMISTRY
(2021)
Article
Engineering, Chemical
Karunamoorthy Saravanakumar, Govindan Jagan, Jongho Lee, Chang Min Park
Summary: In this study, rod-like carbon and nitrogen codoped In2O3-modified GdFeO3 heterostructure catalysts were prepared by simple pyrolysis and a wet-chemical route. The synthesized catalysts showed excellent photocatalytic performance for tetracycline degradation.
Article
Engineering, Chemical
Lixu Wu, Chun Sun, Shancheng Jiao, Jun Hu, Jia Yang, Feipeng Jiao
Summary: By studying the synthesis of C3N5 materials and CoAl-LDH composite materials, and applying them to photocatalytic treatment of organic pollutants in natural water bodies, it was found that the CoAl-LDH/C3N5 composite material achieved a degradation efficiency of 94.02% in pure water and 91.85% in Xiangjiang water after 120 minutes of light exposure. The study showed that the formation of an internal electric field at the interface of CoAl-LDH/C3N5 accelerated the separation and migration of photogenerated electrons and holes, thereby improving the photocatalytic degradation performance.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Engineering, Environmental
Madhuri M. Kininge, Swapnil K. Gujar, Parag R. Gogate, Ankit Sharma, Bighnaraj R. Mishra, Deependra Singh
Summary: Methylamine (MA) degradation was studied using different processes based on cavitation and oxidants. The effects of operating parameters such as treatment temperature, US power, pH, and oxidant loading on degradation were investigated. The combination of ultrasound and potassium persulfate (US+KPS) was found to be the most efficient and economical method, achieving a 97.3% removal of MA within 2 hours. A longitudinal horn reactor combined with KPS provided a cavitational yield almost 4 times higher than that seen in a simple ultrasound horn. Overall, the US+KPS scheme showed high energy-efficiency and cost-effectiveness, with a 94% degradation of MA at an operating cost of 0.03 $/L.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Multidisciplinary Sciences
Mehrab Aghazadeh, Amir Hessam Hassani, Mehdi Borghei
Summary: This study aims to optimize the photocatalytic proxone process using a synthesized ZnO-Fe3O4 nanocatalyst for petroleum wastewater treatment. The results showed that the removal efficiency of COD was 85.3%, while BOD5 and TPH had removal efficiencies of 91.1% and 89.7%, respectively. Therefore, the photocatalytic proxone process has the potential to treat petroleum wastewater.
SCIENTIFIC REPORTS
(2023)
Review
Chemistry, Multidisciplinary
Elissa Makhoul, Madona Boulos, Marc Cretin, Geoffroy Lesage, Philippe Miele, David Cornu, Mikhael Bechelany
Summary: This review focuses on the removal methods and influencing factors of organic pollutants in water, with a particular emphasis on pharmaceutical pollutants, especially paracetamol. The advantages and performance of electro-oxidation, photocatalysis, and sulfate radicals are discussed, with a focus on a unique anode material, calcium copper titanate (CCTO), and its synthesis techniques, modifications, and applications for water remediation.
Article
Engineering, Chemical
Alicia L. Garcia-Costa, Jaime Carbajo, Asuncion Quintanilla, Francisco J. Yuste-Cordoba, Jose A. Casas
Summary: This study explores the feasibility of Fenton oxidation and Catalytic Wet Peroxide Oxidation (CWPO) at high temperature for treating complex cork-boiling wastewater. The results suggest that CWPO at 100 degrees C using activated carbon as catalyst is a promising alternative for on-site treatment of CBW.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Svenja Baues, Heinrich Vocke, Lena Harms, Konstantin K. Ruecker, Michael Wark, Gunther Wittstock
Summary: Metal oxide libraries were generated for photoanodes for the oxygen evolution reaction (OER) through printing of metal salt solutions followed by calcination. The best performing composition was Cu48Ga3W49Ox. Characterization of the electrodes using various techniques was also conducted.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Electrochemistry
Shokoufeh Rastgar, Sebastian Pleis, Yanzhen Zhang, Gunther Wittstock
Summary: A strategy is proposed to generate single microdrops with femtoliter to microliter volumes as a liquid reactor and to guide them towards a reactive surface within a viscous carrier liquid. Reactions of the drop content with the surface are exemplified by exhaustive electrolysis of the reactor content, making use of an ion-conducting pathway through the carrier liquid. The mechanisms by which the redox-active species from the aqueous drop reach the electrode surface were established by a combination of time-lapse microscopy of the drop shape, chronoamperometric recording of the single drop electrolysis, and modelling of the reaction-transport problem, showing that partitioning over the liquid-liquid interface must be a key step in this mechanism. The possibilities of reagent delivery and external triggering of a reaction are expanded by the possibility for controlled addition of further dissolved reactants to the liquid microreactor.
Article
Chemistry, Multidisciplinary
Patricia Scheurle, Andre Maehringer, Tabea Haug, Alexander Biewald, Daniel Axthammer, Achim Hartschuh, Lena Harms, Gunther Wittstock, Dana D. Medina, Thomas Bein
Summary: This study integrated a flexible, electron-rich building block into the backbone of a metal-organic framework with a MOF-74 topology. The resulting structure exhibited an unusual helical rod-like morphology and showed visible light absorption and photoluminescence properties.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Chemistry, Physical
Alex Ricardo Silva Olaya, Franziska Kuehling, Christoph Mahr, Birthe Zandersons, Andreas Rosenauer, Joerg Weissmueller, Gunther Wittstock
Summary: Nanoporous gold (NPG) with less than 1% residual Ag content was studied as an electrocatalyst for the oxidation of methanol, formaldehyde, and formate. The surface structure and oxidation reaction of NPG can be controlled by adjusting the Ag content and potential. Ag has a significant impact on the onset potential and peak current density of the catalytic reaction.
Editorial Material
Electrochemistry
Shokoufeh Rastgar, Sebastian Pleis, Yanzhen Zhang, Gunther Wittstock
Article
Chemistry, Physical
Bastian Krueger, Konstantin Kimon Rucker, Gunther Wittstock
Summary: The reoxidation of Li2O2 in Li-O-2 cells is a high overpotential reaction, and using redox mediators can decrease the overpotential, reduce the formation of reactive oxygen species, and convert all the Li2O2. The rate constants of the redox reaction between the mediators and Li2O2 vary with different electrolytes, and the rate constants in ionic liquids are lower than in ether-based electrolytes.
ACS APPLIED ENERGY MATERIALS
(2022)
Correction
Chemistry, Physical
Alex Ricardo Silva Olaya, Franziska Kuhling, Christoph Mahr, Birthe Zandersons, Andreas Rosenauer, Jorg Weissmueller, Gunther Wittstock
Article
Nanoscience & Nanotechnology
Hyunah Kwon, Hannah-Noa Barad, Alex Ricardo Silva Olaya, Mariana Alarcon-Correa, Kersten Hahn, Gunther Richter, Gunther Wittstock, Peer Fischer
Summary: Plasma treatment of metal nanoparticles formed by physical vapor deposition is a general method to fabricate nanoporous metallic films, which are free of impurities, highly curved ligaments, and nanopores. The films are ultrathin, but robust and well connected, making them highly promising for various applications such as transparent conducting electrodes.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Review
Chemistry, Multidisciplinary
Gunther Wittstock, Marcus Baeumer, Wilke Dononelli, Thorsten Kluener, Lukas Luehrs, Christoph Mahr, Lyudmila Moskaleva, Mehtap Oezaslan, Thomas Risse, Andreas Rosenauer, Anne Staubitz, Joerg Weissmueller, Arne Wittstock
Summary: Nanoporous gold (NPG) is a nanoscale material with a network of metallic struts and interconnected pores formed from gold alloys through oxidative dissolution. It exhibits good catalytic activity, particularly in the aerobic partial oxidation of methanol. This review discusses methods to control NPG morphology and composition, explores mechanistic understanding from quantum chemical studies, and highlights best practices for material preparation and characterization.
Article
Electrochemistry
Sweety Ann Samuel, Gunther Wittstock
Summary: Nanoparticle-imprinted matrices (NAIMs) were prepared by attaching ammonium-terminated SiO2 nanoparticles (NPs) to activated glassy carbon. The selectivity of the polymer matrix towards Au analyte NPs was tuned by conjugate addition of substituted thiols to the matrix. The amount of Au NPs inside the complementary cavities of the NAIMs was quantified by charge transfer during electrodissolution.
Letter
Electrochemistry
Gunther Wittstock
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
(2023)
Article
Chemistry, Physical
Hyunah Kwon, Hannah-Noa Barad, Alex Ricardo Silva Olaya, Mariana Alarcon-Correa, Kersten Hahn, Gunther Richter, Gunther Wittstock, Peer Fischer
Summary: Impurity-free nanoporous gold films with controllable pore sizes are fabricated using a plasma-enabled dry synthetic route, which eliminates sacrificial metals and solution processing. These films possess highly curved ligaments, are remarkably robust, and stable over hundreds of electrochemical cycles. Furthermore, they contain many catalytically active sites, making them highly promising for electrocatalytic applications.
Article
Chemistry, Physical
Svenja Speldrich, Michael Wark, Gunther Wittstock
Summary: Research has found that the application of protective layers to the photoabsorber can improve stability while maintaining favorable absorption characteristics. In this study, protective layers of Bi, Fe, Co, and Ni oxides were used, with Bi oxides showing the best combination of stability and activity, demonstrating their importance in enhancing photoactivity.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Dennis Berends, Dereje H. Taffa, Hosni Meddeb, Patrick Schwager, Kai Gehrke, Martin Vehse, Carsten Agert
Summary: Defect-rich black titanium dioxide (B-TiO2) has been extensively studied for its enhanced photoelectrochemical efficiency compared to titanium dioxide (TiO2). A new sputtering process has been introduced to produce B-TiO2 thin films without hydrogen, and it can alter the density of defect states in a controlled manner. The comprehensive studies show that increasing the density of Ti3+ states in the films enhances conductivity and light absorption.
ADVANCED PHOTONICS RESEARCH
(2023)
Review
Chemistry, Physical
Dereje H. Taffa, Danni Balkenhohl, Mandana Amiri, Michael Wark
Summary: This article presents the current research state of using nickel-based metal-organic frameworks (MOFs) as catalyst materials for alkaline electrolysis, discussing strategies for improving catalytic performance and comparing OER activities based on performance metrics. Nickel-based MOFs are demonstrated to have excellent activity and tunability, making them promising catalysts for hydrogen production.